IGCSE Biology Paper-4: Specimen Questions with Answers 76 - 78 of 279

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Question 76

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Essay▾

What is difference between fibrous roots and taproots?

Explanation

Image Shows Different Types of Roots
TaprootsFibrous roots
It consist of a single main root, which gives out lateral branches.A number of thread like roots arising from the base of the stem
Do not come from embryonal axisArises from embryonal axis
The main root grows vertically downwards and is longer than it branchesThey spread out nit he soil to provide firm support to the plant.
Example- carrot, mustard, gram, radish, beansExample- grasses, wheat, rice, maize and barley

Question 77

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Essay▾

If, a person is suffering from DNA deficiency. How will he be cured?

Explanation

Person can be cured by the help of gene therapy. In such therapy, ADA gene has taken from the leucocytes of a healthy person and inserted it into a retrovirus than it is injected to the lymphocyte stem cells of patient along with helper virus. Lymphocytes generated by these stem cells had normal ADA gene. Permanent cure can be done when functional ADA gene is introduced in cell of early embryo.

Passage

The figure shows the exchange of two gases between plant and animal.

Find the Values in 2 Empty Boxes

Question 78 (1 of 2 Based on Passage)

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Short Answer▾

Which processes are done in given figure. Explain them?

Explanation

Photosynthesis process and respiration occur.

Photosynthesis-It is a process, which is used by plants and other organisms to convert light energy into chemical energy.

Respiration- Respiration is a process, which occur inside the living cells of every type of organism. It is the sum total of the physical and chemical processes in an organism by which oxygen is transfer to tissues and cells, and the oxidation products, carbon dioxide and water, are given off.

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